Start Here October '20

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74 S T A R T H E R E 2 0 2 0 UV-LED Most UV print RIP software allow control over how white ink is used. In this case, we use spot mode for the white ink. Spot mode means that any objects filled with a "spot white" color-fill are printed using only white ink. In some cases, a spot color swatch must first be created in the layout software then defined for use with white ink. This sounds more complicated than it really is. Most often, all that is needed to designate a spot swatch color as white ink is to simply name the swatch "white" or "spot white." The spot white color swatch tells the RIP software to use white ink only within the areas where the spot color is detected. In this case, the magenta-colored shapes in the layout are color-filled with the "spot white" color. The metal sub- strate can now be prepared for printing. If the substrate has protective masking adhered to the surface, the masking can now be removed. Once the metal substrate has adhe- sion promoter applied, set it onto the printer bed and align it to the origin point on the bed. If necessary, adjust the print head height to the proper distance away from the substrate surface. If the UV printer adjusts the print head height automatically before printing, this step is not necessary. The print job can now be sent (Figure 3). After the flat print is done, open the printer lid and inspect the print job to make sure the print is correct and free of blemishes. The raised portions of the sign can now be printed. It may be neces- sary to adjust the print head height again in order to compensate for the raised printed elements. Figure 4 shows the artwork setup for printing the raised portions of the sign. Since all printed elements in this step are printed raised with white ink only, it is not necessary to designate the graphics with the spot white magenta color again in this step. The raised white parame- ters will be set within the RIP software (Figure 5). Finally, the color overlay can be printed over top of the raised elements (Figure 6). The print mode used in this Though the printed ink is cured to the touch, a full cure of the ink usually requires about 24 hours after printing to complete. Figure 8

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